Fjölrit RALA - 15.12.2000, Page 29

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Table 26. Crude protein content (%) in the yield on different harvest dates in Iceland, 1996 and 1997, n=2.
Harvest dates 1996
4.6. 18.6. 2.7. 16.7. 30.7.
Seida 18.9 13.5 10.5 8.9 8.2
Vega 21.1 14.7 10.9 8.5 7.3
Engmo 21.8 14.6 10.1 8.6 7.9
Harvest dates 1997
28.5.*) 10.6. 24.6*) 8.7. 22.7.
Lavang 24.7 16.7 12.0 9.2 9.2
Fylking 26.9 18.4 14.8 10.9 8.6
Seida 23.4 17.1 13.0 9.4 8.3
Vega 26.7 17.9 13.5 9.9 7.0
Engmo 25.8 16.7 12.7 10.5 8.4
Leikvin 28.2 20.5 15.5 10.7 9.2
Leik 26.5 18.0 12.3 10.1 9.1
Unnur 24.1 17.3 12.7 10.1 8.7
Norcoast 20.6 14.3 10.6 8.2 7.3
*) Analysed with NIR.
Digestibility
The in vitro method gives a good estimate of digestibility but has a relative high variation.
This means that more than one analysis per sample is needed for a good estimate. In 1996 all
samples from one of the two blocks were analyzed twice while the other block was analyzed
once. The standard deviation of repeated analyses of the same samples was 1.7 percentage
units and between samples 1.87. The standard deviation between samples in 1997 was 1.81.
Kollafjoróur. Table 27 shows the digestibility of the grass varieties on different harvest dates
in 1996 and 1997. On May 29 there was no yield at all of Poapratensis and therefore an extra
harvest was taken on July 24.
Table 27. Digestibility of DM (%) in Kollafjarður on different harvest dates 1996 (n=3) and 1997 (n=2).
Harvest dates 1996
29.5. 12.6. 26.6. 10.7. 24.7. 1.8.
Lavang 81.3 78.7 77.9 74.9 71.2
Fylking 80.3 77.4 75.5 73.3 69.9
Seida 85.4 81.3 77.7 72.2 64.7
Vega 85.5 83.5 77.6 75.3 68.0
Engmo 85.3 83.7 79.9 77.9 71.2
Harvest dates 1997
2.6. 16.6. 30.6. 14.7. 30.7.
Lavang 78.7 78.6 77.9 74.1 68.9
Fylking 79.3 78.5 74.9 67.3 68.4
Seida 80.1 78.7 76.0 69.6 66.5
Vega 82.1 79.9 76.6 72.4 68.1
Engmo 80.9 80.1 77.2 70.2 65.6